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Frequency band extension method and device

A technology of frequency band expansion and spectrum expansion, which is applied in the field of frequency band expansion methods and devices, can solve problems such as the inability to meet the high requirements of music signal quality, and achieve the effects of meeting high requirements, improving quality, and repairing poor sound quality

Active Publication Date: 2020-07-03
TENCENT MUSIC ENTERTAINMENT TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with ordinary audio signals (such as voice signals), music signals have higher quality requirements. Using traditional frequency domain-based frequency band extension technology to expand the frequency band of music signals cannot meet the high quality requirements of music signals.

Method used

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  • Frequency band extension method and device
  • Frequency band extension method and device
  • Frequency band extension method and device

Examples

Experimental program
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Embodiment 1

[0036] see figure 2 , figure 2 It is a schematic flowchart of the frequency band extension method provided in the embodiment of the present application. The specific flow of the frequency band extension method provided in the embodiment of the present application may be as follows:

[0037] Step S201. Input the mel-frequency cepstral coefficient MFCC of the narrow-band signal to be processed into the first preset network, and use the first preset network to predict the envelope in the frequency domain to obtain the envelope of the high-frequency spectrum.

[0038] The narrowband signal to be processed refers to an audio signal to be processed, for example, a low-quality music signal, a low-quality voice signal, and the like.

[0039]In a specific implementation, before performing band extension processing on the narrow-band signal to be processed, it is necessary to use the preset signal to train the required correlation network. The required correlation networks include:...

Embodiment 2

[0067] The method described in Embodiment 1 will be further described in detail with examples below.

[0068] In this embodiment, the frequency band extension method provided by the embodiment of the present application is described by taking extending a low-quality music signal to a high-quality music signal as an example.

[0069] Please also refer to 3a and Figure 3b , the frequency band extension method of this embodiment, the specific process can be as follows:

[0070] Step S301. Sampling is performed from a preset wideband signal to generate a preset narrowband signal.

[0071] Step S302, using the preset wideband signal and the preset narrowband signal as training data to perform network training to obtain the first preset network, the second preset network and the third preset The internet.

[0072] For specific training processes of the first preset network, the second preset network, and the third preset network, reference may be made to the description of the f...

Embodiment 3

[0089] In order to better implement the above method, the present invention also provides a frequency band extension device, such as Figure 4 As shown, the frequency band expansion device of this embodiment includes: an envelope prediction unit 401, a spectrum expansion unit 402, a frequency-time transformation unit 403, a time domain interpolation unit 404, and a signal fusion unit 405, as follows:

[0090] (1) Envelope prediction unit 401;

[0091] The envelope prediction unit 401 is used to input the mel frequency cepstral coefficient MFCC of the narrowband signal to be processed into the first preset network, and use the first preset network to perform frequency domain envelope prediction to obtain the high frequency spectrum envelope .

[0092] The narrowband signal to be processed refers to an audio signal to be processed, for example, a low-quality music signal, a low-quality voice signal, and the like.

[0093] Before performing band extension processing on the narr...

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Abstract

According to embodiment, the invention provides a frequency band expansion method and an expansion device, wherein the frequency band expansion method comprises the following steps: inputting a Mel-frequency cepstrum coefficient of a to-be-processed narrowband signal into a first preset network, and implementing frequency-domain envelop forecasting on the basis of the first preset network, so thathigh-frequency spectrum envelop is obtained; in accordance with the high-frequency spectrum envelop obtained from forecasting, expanding a low-frequency spectrum of the to-be-processed narrowband signal as a high-frequency spectrum; implementing frequency-time transformation on the high-frequency spectrum obtained from expansion, so that a first target high-frequency signal is obtained; inputtingthe to-be-processed narrowband signal into a second preset network, and implementing time-domain interpolation based on the second preset network, so that a second target high-frequency signal is obtained; and inputting the first target high-frequency signal and the second target high-frequency signal into a third preset network, and fusing the first target high-frequency signal and the second target high-frequency signal by virtue of the third preset network, so that a target broadband signal is obtained. According to the embodiment provided by the invention, the requirement of a music signal on high quality can be satisfied.

Description

technical field [0001] Embodiments of the present invention relate to the field of audio processing, and in particular to a frequency band extension method and device. Background technique [0002] Band extension is a common technology in audio signal processing, which is usually applied in audio codec systems to improve the quality of audio signals. Traditional frequency band extension technologies for audio signals are basically processed in the frequency domain. [0003] Compared with ordinary audio signals (such as voice signals), music signals have higher quality requirements. Using traditional frequency domain-based frequency band extension technology to expand the frequency band of music signals cannot meet the high quality requirements of music signals. Contents of the invention [0004] Embodiments of the present invention provide a frequency band extension method and device, which can meet the high quality requirements of music signals. [0005] The frequency b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/038G10L21/0388G10L25/24
CPCG10L21/038G10L21/0388G10L25/24
Inventor 王征韬
Owner TENCENT MUSIC ENTERTAINMENT TECH SHENZHEN CO LTD
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